what's b12 injections for Do You Need a Prescription Injections? Sublingual B12 vs. B12 Injections:

B12 shots may help you get more red blood cells, reduce symptoms like weakness and fatigue, and give enhanced benefits compared to oral vitamins

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They evolve based on real results, not a fixed calendar

individualized schedules remain paramount, and combination with oral or vaginal progesterone is recommended for women with an intact uterus to mitigate endometrial proliferation

[43] Blood loss from GI bleeding, in addition to blood loss during menstruation, makes female runners and endurance athletes especially susceptible to iron deficiency